Changes in surface wind directions in Estonia during 1966–2008 and their relationships with large-scale atmospheric circulation; pp. 220–231

Authors

Jaak Jaagus, Ain Kull

Abstract

Changes in the percentages of eight main surface wind directions at 14 meteorological stations in Estonia, Northeast Europe, were studied during 1966–2008. Long-term changes in wind directions are related to variations in the large-scale atmospheric circulation but partly also to changes in the surroundings of the stations and in wind obstacles. Significant alterations in wind directions were determined, and found to be the strongest in the winter season. The percentages of W and SW winds have clear positive trends, while SE, E and NE winds are characterized by negative tendencies in winter. In conclusion, wind directions have probably been shifted from east to west. Differences in trends between the stations are explained by changes in wind obstacles around the stations. The trends in wind roses in Estonia were caused by the intensification of the westerly circulation over the Atlantic/European sector during the winter season.

Jaagus , J. 2006. Climatic changes in Estonia during the second half of the 20th century in relationship with changes in large-scale atmospheric circulation. Theoretical and Applied Climatology , 83 , 77–88. http://dx.doi.org/10.1007/s00704-005-0161-0

Jaagus , J. 2009. Long-term changes in frequencies of wind directions on the western coast of Estonia. Publications of the Institute of Ecology , Tallinn University , 11 , 11–24 [in Estonian , with English summary].